Tested that the package compiles normally against 21.2, and checked that
it is up to date with respect to the version in the trunk of svn.  This
package is needed for the lumi block metadata tools, among other
reasons, in AthAnalysis (no need in AnalysisBase)


Former-commit-id: 29d3317b5042c769cb7fb3693fb98e73677c9fda